.middle {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.middle > div:nth-child(1) {
    flex-direction: column;
/ / column：主轴为垂直方向，起点在容器的上沿。 display: flex;
    justify-content: center;
    height: 50px;
    width: 900px;
}

.middle > div:nth-child(1) > div {
    display: flex;
    justify-content: center;
}

.middle > div:nth-child(1) > div:nth-child(1) > div:nth-child(1) {
    border: 2px solid rgb(218, 25, 80);
    margin-top: 30px;
    margin-bottom: 30px;
}

.middle > div:nth-child(1) > div:nth-child(1) > div > div:nth-child(1) {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 30px;
}

.middle > div:nth-child(1) > div:nth-child(1) > div > div:nth-child(2) {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
}

.middle > div:nth-child(2) > div:nth-child(1) {
    height: 150px;
    width: 1200px;
    flex-direction: column-reverse;
}

.middle > div:nth-child(2) > div:nth-child(1) > div {
    padding-top: 80px;
    padding-left: 600px;
    font-size: 30px;
    color: rgb(211, 211, 211);
}

.middle > div:nth-child(2) > div:nth-child(2) {
    height: 450px;
    background-image: url("../img/bg.jpg");
    width: 1200px;
    display: flex;
    flex-direction: row;
}

.middle > div:nth-child(2) > div:nth-child(2) > div:nth-child(1) {
    height: 500px;
    width: 600px;
    /*border: 5px solid yellow;*/

}

.middle > div:nth-child(2) > div:nth-child(2) > div:nth-child(1) > div {
    height: 500px;
    width: 450px;
    /*border: 5px solid red;*/
    margin-top: -100px;
    margin-left: 150px;
}

.middle > div:nth-child(2) > div:nth-child(2) > div:nth-child(2) > div:nth-child(1) {
    font-size: 20px;
    color: white;
    text-indent: 2em;

    width: 500px;
    height: 300px;
    /*border: 5px solid rebeccapurple;*/
}

.middle > div:nth-child(2) > div:nth-child(2) > div:nth-child(2) > div:nth-child(2) {
    height: 120px;
    width: 500px;
    background-color: rgb(220, 28, 77);
    display: flex;
    align-items: center;
    margin-top: -20px;

}

.middle > div:nth-child(2) > div:nth-child(2) > div:nth-child(2) > div:nth-child(2) > div {
    width: 130px;

    /*border: 5px solid rebeccapurple;*/
}

.middle > div:nth-child(2) > div:nth-child(2) > div:nth-child(2) > div:nth-child(2) > div > div:nth-child(1) {
    display: flex;
    justify-content: center;
    height: 70px;

    /*border: 5px solid aquamarine;*/
}

.middle > div:nth-child(2) > div:nth-child(2) > div:nth-child(2) > div:nth-child(2) > div > div:nth-child(2) {
    display: flex;
    justify-content: center;
    /*border: 5px solid yellow;*/
    color: white;
}


.middle > div:nth-child(3) > div {
    display: flex;
    justify-content: center;
}

.middle > div:nth-child(3) > div:nth-child(1) > div:nth-child(1) {
    border: 2px solid rgb(218, 25, 80);
    margin-top: 30px;
    margin-bottom: 30px;
}

.middle > div:nth-child(3) > div:nth-child(1) > div > div:nth-child(1) {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 30px;
}

.middle > div:nth-child(3) > div:nth-child(1) > div > div:nth-child(2) {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
}

.middle > div:nth-child(3) > div:nth-child(2) > div {
    height: 300px;
    width: 250px;
    margin-left: 30px;
}

.middle > div:nth-child(3) > div:nth-child(2) > div > div:nth-child(1) {
    border: 4px solid brown;
}

.middle > div:nth-child(3) > div:nth-child(2) > div > div:nth-child(2) {
    background-color: rgb(220, 28, 77);
    margin-left: 10px;
    margin-right: 10px;
    height: 100px;
    color: white;
    text-indent: 1.5em;
}

.middle > div:nth-child(3) > div:nth-child(2) > div > div:nth-child(2) > div:nth-child(1) {
    display: flex;
    justify-content: center;
}

.middle > div:nth-child(4) > div {
    display: flex;
    justify-content: center;
}

.middle > div:nth-child(4) > div:nth-child(1) > div:nth-child(1) {
    border: 2px solid rgb(218, 25, 80);
    margin-top: 30px;
    margin-bottom: 30px;
}

.middle > div:nth-child(4) > div:nth-child(1) > div > div:nth-child(1) {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 30px;
}

.middle > div:nth-child(4) > div:nth-child(1) > div > div:nth-child(2) {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
}

.middle > div:nth-child(4) > div:nth-child(2) > div:nth-child(1) {
    width: 600px;
    height: 500px;
    /*border: 2px solid rgb(218, 25, 80);*/
}

.middle > div:nth-child(4) > div:nth-child(2) > div:nth-child(1) > div:nth-child(2) {
    display: flex;
    flex-direction: row;
}
.middle > div:nth-child(4) > div:nth-child(2) > div:nth-child(1) > div:nth-child(2) > div {
    margin-top: 10px;
    margin-left: 20px;
}

.middle > div:nth-child(4) > div:nth-child(2) > div:nth-child(2) {
    width: 400px;
    height: 500px;
    /*border: 2px solid blue;*/
}
.middle > div:nth-child(4) > div:nth-child(2) > div:nth-child(2) > div {
    display: flex;
    justify-content: center;

    margin-top: 20px;

}


